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1. The power module reported this fault. After pulling out the module, do not plug it back into the cabinet. If you do this, the machine will explode and cause a more serious fault.
2. During the warranty period of this large project, it is recommended to conduct a follow-up every three months to understand and help customers maintain the machine. Because when the customer replaces the battery and closes the switch, the machine reports uneven current, which may be caused by the customer's unfamiliarity with the operation. It is necessary to minimize the mistakes of the customer's operation. The loss will be very large if there is a fault in multiple units.

FAQ for "Rectifier Over Temp" and "Rectifier Fail" Alarms
Applicable Models: HRC3320/25 S L
Q: My UPS from your company displayed a "Rectifier Over Temp" alarm during operation today, followed immediately by a "Rectifier Fail" alarm. What causes these alarms?
A: There are two main causes for "Rectifier Over Temp" and "Rectifier Failure" alarms:
1.The temperature detection probe at the relevant detection position is damaged.
2.The circuit monitoring the temperature detection probe is faulty.
Q: How should I resolve these issues?
A: Based on the equipment model you provided, the specific troubleshooting steps are as follows:
1. Check the temperature detection probes (power off the unit first)
1）Locate the rectifier board and disconnect the temperature detection probe connectors (J13/J14/J15).
2）Measure the resistance of the temperature probes: the normal resistance should be 4.6–5.4 k Ω.
3）If any probe shows abnormally low resistance, replace it first, then restart the UPS to check if the alarms are cleared.
2. Check the signal cables between the temperature probes and the control board
1）If the resistance of the temperature probes is normal, reinstall them.
2）Unplug the J12 connector on the rectifier board, power on the UPS, and check whether the alarms still exist.
①If the faults disappear, the rectifier power board is abnormal.
②If the faults remain, the rectifier control board is abnormal.

FAQ For Troubleshooting The Alarm Of ‘Low Battery Voltage’
Applicable Models: HT(R)X 01-20KVA S L
Q: The UPS displays fault code 65. According to the manual, this fault indicates low battery voltage. How should I troubleshoot the UPS?
A: When the UPS shows fault code 65 (low battery voltage), please follow the troubleshooting steps below:
1.Check the actual total battery voltage. If the total voltage is out of the normal range, measure the voltage of each battery cell and replace any defective cells.
2.Check whether the series cables between batteries and the connection cables from batteries to the internal power board of the UPS are securely connected (no loose connections, obvious burning, etc.). 
If any abnormality is found, power off the unit first, replace the cables, then restart the UPS to check if the fault is cleared.
3.Check whether the parameters displayed on the UPS panel / MTR software are consistent with the actual measured values (battery voltage, battery capacity, etc.). If the actual measured values are normal but the displayed values on the UPS screen or MTR software do not match, the internal battery detection circuit of the UPS may be faulty.
Path to view battery data in MTR:Home page → Battery Data
4.If all three checks above show no abnormality, use the MTR software to verify whether the configured battery parameters match the actual battery specifications in use.
Path to check battery parameter settings in MTR:ServSetting → Battery Setting (Please carefully check and compare all items in this section.)

1.Connect the device to the MTR software and change the battry maintenance reminder period for the UPS battery in Service Settings ->Battery Settings.
2. Users can use the V1.98C version of MTR software. In the controlCmd function (password: 12345678) ->Function key menu ->Reset battery history Data.
Note：UPS has the following alerts Bypass Fan Expired-Set，Dust Filter Expired-Set，Battery Expired -Set. This can be handled using this method.

1. The local of GD5000 refers to the HMI control start, and the others are remote. 
2. GD5000 has a level 2 option to control remote in-place start ①Function code P0.01; ② Remote in-place knob of the man-machine interface of the control cabinet Local start logic: P0.01=1 (local command channel), the knob does not work Remote start logic: P0.01=remote communication command (terminal, communication, etc.), the knob is local=HMI start, the knob is remote=remote communication control 
3. The shutdown of VFD is not controlled by the communication instruction. For GD5000 in the operating state, any shutdown command sent by the instruction is accepted and executed.

 1. First of all, measure whether the voltage at the upper and lower ends of the circuit breaker and contactor is normal, and confirm whether there is a lack of phase, under voltage, or power loss phenomenon in the control power supply;
2. If the control electricity is normal, further check the control circuit, whether the terminals on the system IO board are loose, tighten the screws to ensure good contact;
3. Use a clamp meter to measure the running current of the fan. If the current is greater than the fan's rated current, it may be that the fan's phase sequence has changed, causing overload due to reverse operation. Replace the phase sequence.

On the control board, short link J3 & J4 and do not connect an external 24V supply to terminals CN4 (24+).

The customer’s site has an input and output voltage of 10 kV and  frequency range of 0–300 Hz. We would like to know what the current operating frequency range is for our company’s Version 07 integrated high-voltage variable frequency drive.

A: The operating range of our company’s Version 07 high-voltage variable frequency drive currently spans 0–600 Hz, which fully meets the customer’s requirements.

Whether the heat dissipation fan at the top of the cabinet is reversed, whether it is faulty, whether the inlet filter mesh is blocked, whether the ambient temperature is too high, regularly clean the inlet filter mesh of the unit cabinet and transformer cabinet, and keep the environment clean on-site. 2 The temperature sensor is faulty, check whether the circuit is broken or short-circuited, and whether the sensor is damaged.